root password missing

Hi .
I need to recover my aix root password. I started the AIX partition using the CD and then starting in maintenance mode and the shell but I am not able to run de passwd command from there. Any idea what I can do from the shell to reset the root password.
Thanks

Thanks.
This is the situation.. When I start in maintenance mode I have two vol. groups .. if I choose the first one it gives me the KDB propmt, the second gives me access to the ksh. I choose the 2nd option, it seems you are right and may be the filesystems are not mounted. when I try to mount the fs it says that it is not a known fs.thanks

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